Preparation process for lithium niobate crystal with near stoichiometric ratio
A preparation process, lithium niobate technology, applied in the field of photoelectric material preparation, can solve the problems of difficulty in obtaining lithium niobate crystals with uniform composition, crystal composition deviation from stoichiometric ratio, etc., and achieve the effect of accelerating crystal growth and improving production efficiency
Inactive Publication Date: 2005-03-16
NANKAI UNIV
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Problems solved by technology
Therefore, it is difficult to obtain lithium niobate crystals with uniform composition
The solid composition crystallized from the molten lithium niobate melt with a molar ratio of Nb:Li=51.4:48.6 is consistent with the melt composition, and it is relatively easy to obtain lithium niobate crystals with uniform composition, but the crystal composition deviates from the stoichiometric ratio
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[0011] This near-chemical ratio lithium niobate crystal preparation process, in the process of growing lithium niobate crystals by the double-crucible Czochralski method, uses a melt of Nb:Li=42:58~41:59 to grow Nb:Li=1 The crystal is characterized in that: along with the growth of the crystal, the melting raw material particle of Nb:Li=64:36 is added into the melt, so that the composition of the melt remains unchanged,
[0012] Expressed in abbreviated form as follows:
[0013] .
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The invention relates to a near stoichiometric lithium niobate crystal preparation, especially to the preparation process of lithium niobate of uniform constituent. It belongs to photoelectric material preparation technology field. Because lithium niobate is not congruent melting, the solid constituent is not identical with melt constituent, and melt constituent change sustainingly, so does solid constituent of crystal, so lithium niobate crystal of uniform constituent is difficult to get. The invention discloses a near stoichiometric lithium niobate crystal preparation process: in double crucible czochralski growth method lithium niobate crystal growing technology, adding Nb:Li=64:36 melt material granule as the crystal grow, making the constituent of melt invariable. The beneficial effect of the invention: adding melt for diffusion makes the crystal grow fast, promote the production efficiency. Material is 36mol% Li, and is lowest melting point eutectic temperature material in Li#-[2]O.Nb#-[2]O#-[5] system in which Li content is less than 50mol%, which makes for melt addition.
Description
technical field [0001] The invention relates to the preparation of near-chemical ratio lithium niobate crystals, in particular to the preparation process of lithium niobate crystals with uniform composition, and belongs to the technical field of photoelectric material preparation. Background technique [0002] Since the lithium niobate crystal is not eutectic with the same composition, that is, the molten lithium niobate melt with the molar ratio Nb:Li=1, the crystallized solid composition is inconsistent with the melt composition, and its Nb:Li>1, so that the melt The composition of the crystal is constantly changing, and the composition of the crystalline solid is also constantly changing. Therefore, it is difficult to obtain lithium niobate crystals with uniform composition. The solid composition crystallized from the molten lithium niobate melt with a molar ratio of Nb:Li=51.4:48.6 is consistent with the melt composition, and it is relatively easy to obtain lithium n...
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IPC IPC(8): C30B15/00C30B29/30
Inventor 孙军张玲孔勇发李兵刘士国黄自恒陈绍林许京军
Owner NANKAI UNIV